CN114136831A - Method for rapidly measuring moisture of coal - Google Patents
Method for rapidly measuring moisture of coal Download PDFInfo
- Publication number
- CN114136831A CN114136831A CN202111423382.5A CN202111423382A CN114136831A CN 114136831 A CN114136831 A CN 114136831A CN 202111423382 A CN202111423382 A CN 202111423382A CN 114136831 A CN114136831 A CN 114136831A
- Authority
- CN
- China
- Prior art keywords
- coal
- mass
- drying
- sample
- coal sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004458 analytical method Methods 0.000 claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 29
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract 4
- 238000001816 cooling Methods 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000005070 sampling Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004939 coking Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
Abstract
The invention relates to the technical field of coal quality detection, in particular to a method for quickly determining coal quality moisture, which comprises the following steps: 1) preparation of an analysis sample: drying a certain amount of coal sample with a certain particle size in an environment with the temperature of not higher than 40 ℃ until the mass is constant, crushing the coal sample, 2) weighing a certain amount of a common analysis sample coal sample, placing the coal sample in a drying box with the temperature of 145 ℃ for drying by air for 10min until the mass is constant, taking out a weighing bottle from the drying box, immediately covering the weighing bottle, then placing the weighing bottle in a dryer for cooling to room temperature, and weighing, 3) repeating the inspection drying for 30min each time until the mass of two continuous dried coal samples is reduced by no more than a limit value or the mass is increased until the mass is increased in the latter case, taking the mass before the mass is increased as the standard, and the drying inspection is not needed when the moisture is below 2.00 percent. 4) And (6) calculating a result. The technical scheme of the invention effectively shortens the determination time, saves manpower and material resources, makes bulk raw materials enter a factory in order, and improves the working efficiency.
Description
Technical Field
The invention relates to the technical field of coal quality detection, in particular to a method for rapidly determining coal quality moisture.
Background
The raw coal storage of coal preparation plants of Qinghai salt lake magnesium industry Limited is an important link for realizing the circular economy and energy development of the integration of metal magnesium. The coal preparation plant enters into the power coal, the coking gas coal and the methanol gas coal. The products of coal preparation plants are mainly supplied to plants in industrial parks for raw materials and fuels. After the analysis and detection results of various coal qualities reach the contract indexes, the coal qualities are respectively stored in a heat supply coal storage bin, a coking coal storage bin and a methanol coal storage bin. According to the production demand, different coal qualities are conveyed from a coal storage yard belt to a heat supply center, a coking plant and a methanol plant, the consumed raw coal amount is increased along with the increase of production in a park, the detection workload is increased, and the consumption time is prolonged. The work efficiency is low and the requirement of rapid detection cannot be met, and the number of coal-conveying vehicles detained in the logistics park of the park is large, so that the transportation vehicles are blocked from normally entering and exiting the intersection. And with the increase of the coal feeding amount of the automobile, coal samples enter the same factory of the coal preparation factory, the sampling amount of the same coal samples according to the proportion of 40 percent of the coal feeding amount is increased, personnel and equipment are continuously operated within 24 hours, normal equipment maintenance and adjustment cannot be kept, and the development of coal quality analysis work in the actual production of the coal preparation factory is not facilitated. The coal preparation plant laboratory is responsible for the coal quality analysis work of the coal samples of the whole plant entering and leaving the plant, and the coal quality analysis is divided into two links of sampling and sample preparation and analysis and inspection. And the coal sampling device is responsible for sampling coal entering from automobiles, coal entering from trains and coal leaving from factories. The method comprises the steps of sampling, manually transferring a sample from a sampling point to a sample preparation chamber, crushing, dividing, drying, grinding, analyzing granularity and the like. In the coal quality analysis and inspection process, each analysis item needs to determine a parallel sample. Coal analysis moisture test samples took 120 minutes, ash test samples taken 90 minutes, heat generation test samples taken 40 minutes, bond index test samples taken 40 minutes, gum layer test samples taken 180 minutes, ash fusion test samples taken 240 minutes. The analysis and inspection work takes long time and has large workload. The chemical composition of coal consists of organic hydrocarbon materials and inorganic minerals, with the moisture in coal being the most variable component. The moisture of coal is the most basic index for evaluating the economic value of coal. The change in the moisture content of coal causes changes in the content of other components or in the calorific value, and has a certain influence on quality inspection, measurement, acceptance, management, and the like of coal. The moisture content of the coal is high, which may cause the running obstacles of the coal conveying and feeding system, and also causes the problems of blockage of the sampling device, increase of moisture loss and the like.
The water in coal is divided into free water and combined water according to the combination state. The free water is water which is absorbed and wetted on the surface of the coal and is adsorbed and condensed in pores inside the coal to be combined in a mechanical mode; the water of combination is the water which is combined with mineral substances in the coal and still remains after the total water is removed, and is also called as crystal water. The free water is combined with the coal in a physical state; the bound water combines chemically with the minerals in the coal, known as crystal water and bound water. According to different structural states of the moisture in coal, the moisture is further divided into external moisture and internal moisture when analyzing and researching coal quality, and the sum of the external moisture and the internal moisture is total moisture (M); because of the action of capillary adsorption force, the internal water of the coal is harder to evaporate than the external water. The coal quality external water can be evaporated after a certain time at the temperature of (45-50) DEG C, and the internal water can be evaporated after a certain time at the temperature of more than 100 ℃.
Industrial analysis of the feed coal determined the moisture of the coal as moisture of the air-dried coal sample (Mad). A certain amount of coal samples are air-dried in advance to prepare air-dried coal samples for testing, and the air-dried coal samples are dried to constant weight at the temperature of 102-105 ℃ so as to be completely dried. Then, the moisture of the air-dried coal sample of the coal is calculated according to the lost mass of the coal sample. The method for analyzing water in coal quality by using the existing method has the disadvantages of long time consumption, low working efficiency and incapability of meeting the requirements of quick and accurate detection. Is not beneficial to the development of coal quality analysis work in the actual production of the coal preparation plant.
Disclosure of Invention
In order to solve the problems, the invention provides a method for rapidly measuring the moisture in the coal quality, and the method has the characteristics of simple, convenient, rapid and accurate operation and the like by optimizing the measuring conditions, greatly shortens the analysis time, improves the inspection efficiency, and has greater practical significance and necessity. In order to achieve the purpose, the invention adopts the following technical scheme:
a coal moisture rapid determination method comprises the following steps: 1. preparation of an analysis sample: drying a certain amount of coal sample with the granularity of less than 13mm in an environment with the temperature of not higher than 40 ℃ until the quality is constant, and crushing the coal sample until the granularity is less than 3 mm.
2. A certain amount of a coal sample of a general analysis sample is weighed and placed in a drying box at 145 ℃ for drying by air blowing for 10min until the mass is constant. The weighing bottle was taken out of the drying oven, immediately capped, and then placed in a desiccator to be cooled to room temperature and weighed.
3. The drying is carried out again for 30min each time until the mass of two continuous dried coal samples is reduced by no more than 0.0010g, or the mass is increased until the latter case, the drying test is not needed when the water content is below 2.00% based on the mass of the previous time of mass increase.
4. Calculation of results
Calculation of coal sample for analysis according to equation (2)
In the formula: mad-mass fraction,%, of water content of the coal sample of the general analytical test;
m-weighing the mass, g, of a coal sample in a general analysis test;
m1mass lost after drying of the coal sample, g.
Detailed Description
The technical solution of the present invention is further explained with reference to the specific embodiments.
A coal moisture rapid determination method comprises the following steps: 1. preparation of an analysis sample: drying a certain amount of coal sample with the granularity of less than 13mm in an environment with the temperature of not higher than 40 ℃ until the quality is constant, and crushing the coal sample until the granularity is less than 3 mm. A certain amount of a coal sample of a general analysis sample is weighed and placed in a drying box at 145 ℃ for drying by air blowing for 10min until the mass is constant. The weighing bottle was taken out of the drying oven, immediately capped, and then placed in a desiccator to be cooled to room temperature and weighed. The drying is carried out again for 30min each time until the mass of two continuous dried coal samples is reduced by no more than 0.0010g, or the mass is increased until the latter case, the drying test is not needed when the water content is below 2.00% based on the mass of the previous time of mass increase.
4. Calculation of results
Calculation of coal sample for analysis according to equation (2)
In the formula: mad-mass fraction,%, of water content of the coal sample of the general analytical test;
m-weighing the mass, g, of a coal sample in a general analysis test;
m1mass lost after drying of the coal sample, g.
The precision of the water content measurement is specified in table 2.
TABLE 1 repeatability limits of moisture measurements
| Mass fraction of water Mad％ | Limit of repeatability% |
| <5.00 | 0.20 |
| 5.00～10.00 | 0.30 |
| >10.00 | 0.40 |
Rapid determination of moisture in comparison to Standard methods
The different coal types were analyzed for comparison of the moisture measurement data under the condition of dry-air drying in a drying oven at 145 ℃ for 10min and under the standard specified condition (dry-air drying in a drying oven at the temperature of 105-110 ℃) for 1 hour).
TABLE 2 comparison of the measurements made by the different methods
| Method | Average measurement time |
| Rapid moisture determination method | 10min |
| Standard methods | 60min |
A determination method is proposed according to different coal types, different time and different conditions of entering a plant.
TABLE 3 comparison table of measured values of water content and temperature for different coal types
In conclusion, the technical scheme of the invention effectively shortens the determination time, saves manpower and material resources and improves the working efficiency.
Claims (4)
1. A coal moisture rapid determination method is characterized in that: the method comprises the following steps:
1) preparation of an analysis sample: drying a coal sample with a certain particle size under the environment of temperature not higher than 40 ℃ until the quality is constant, crushing the coal sample,
2) weighing a certain amount of coal sample of a general analysis sample, placing the coal sample in a drying oven at 145 ℃ for drying by air blowing for 10min until the mass is constant, taking out a weighing bottle from the drying oven, immediately covering the weighing bottle, placing the weighing bottle in a dryer for cooling to room temperature, weighing the coal sample,
3) the checking drying is carried out again for 30min each time until the mass reduction of two continuous dried coal samples does not exceed the limit value, or the mass increase is the latter case, the drying checking is not needed when the moisture is below 2.00 percent based on the mass of the previous time of mass increase.
4) Calculation of results
Calculation of coal sample for analysis according to equation (1)
In the formula: mad-mass fraction,%, of water content of the coal sample of the general analytical test;
m-weighing the mass g of the coal sample in the general analysis test.
2. The method for rapidly measuring the coal moisture as claimed in claim 1, wherein the method comprises the following steps: the limit value in the step 3) is 0.0010 g.
3. The method for rapidly measuring the coal moisture as claimed in claim 1, wherein the method comprises the following steps: the particle size of the coal sample with a certain particle size is less than 13 mm.
4. The method for rapidly measuring the coal moisture as claimed in claim 3, wherein the method comprises the following steps: in the step 1), the coal sample with a certain amount of granularity is dried and crushed to the granularity of less than 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423382.5A CN114136831A (en) | 2021-11-26 | 2021-11-26 | Method for rapidly measuring moisture of coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111423382.5A CN114136831A (en) | 2021-11-26 | 2021-11-26 | Method for rapidly measuring moisture of coal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114136831A true CN114136831A (en) | 2022-03-04 |
Family
ID=80388356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111423382.5A Pending CN114136831A (en) | 2021-11-26 | 2021-11-26 | Method for rapidly measuring moisture of coal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114136831A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103497784A (en) * | 2013-10-08 | 2014-01-08 | 西安元创化工科技股份有限公司 | Method for producing tar, semi-coke and synthetic fuel gas by low-degree of coalification powdered coal |
| CN109342498A (en) * | 2018-10-15 | 2019-02-15 | 西安科技大学 | A kind of Coal Self-ignition Process phase judgement method |
-
2021
- 2021-11-26 CN CN202111423382.5A patent/CN114136831A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103497784A (en) * | 2013-10-08 | 2014-01-08 | 西安元创化工科技股份有限公司 | Method for producing tar, semi-coke and synthetic fuel gas by low-degree of coalification powdered coal |
| CN109342498A (en) * | 2018-10-15 | 2019-02-15 | 西安科技大学 | A kind of Coal Self-ignition Process phase judgement method |
Non-Patent Citations (2)
| Title |
|---|
| 全小盾等: "煤化学与煤分析", 30 April 2012, 中国质检出版社, pages: 134 - 135 * |
| 赵建军等: "煤化学化工实验指导", 31 January 2018, 中国科学技术大学出版社, pages: 2 - 3 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2018337131B2 (en) | Method for detecting raw coal moisture and volatile matter using amount of baseline drift | |
| CN103630450A (en) | Asphalt mixture life prediction method considering fatigue-creep interaction damage effect | |
| CN103090936A (en) | Measuring device and measuring method of novel coal freight volume | |
| CN108267338A (en) | A kind of full-automatic coal is adopted, sample preparation and on-line analysis integral method | |
| CN102411339A (en) | Method for evaluating performance reliability of numerical control equipment | |
| CN201653849U (en) | Online coal quality analyzing device for power plants | |
| Yuan et al. | Using a new aerosol relative optical thickness concept to identify aerosol particle species | |
| Gallego et al. | Determination of mechanical properties for wood pellets used in DEM simulations | |
| CN113899875A (en) | Intelligent coal quality testing system | |
| CN114136831A (en) | Method for rapidly measuring moisture of coal | |
| CN206258376U (en) | It is a kind of for quick inspection Measurement for Grain Moisture Content in X -ray inspection X equipment | |
| CN106033483A (en) | Coal quality express-analysis based on support vector machine | |
| CN103698540B (en) | Rapid determination method and device for ash content in lignocellulosic biomass fuel | |
| Paczkowski et al. | A novel approach to improve the energy and cost efficiency of feedstock drying for pellet production | |
| CN101954656B (en) | Larch lumber mechanical strength grading method | |
| Brokans et al. | Behaviour of creep of timber beams under natural environmental conditions | |
| CN106225842A (en) | A kind of dust pollution online monitoring system | |
| CN105223102A (en) | A kind of method utilizing Near Infrared Spectroscopy for Rapid slurrying material basic density | |
| CN203155569U (en) | Automatic tappet detection sorting machine | |
| Kau et al. | Fine micro-and nanoplastics concentrations in particulate matter samples from the high alpine site Sonnblick, Austria | |
| BR112021008749A2 (en) | method and apparatus to continuously ensure sufficient quality of green pellets | |
| CN105987828B (en) | Integrated sampling method and integrated sampling system for coal sample | |
| Zając | Impact of diameter of pressing channels and moisture on parameters of pelleting process of virginia mallow biomass | |
| Ahmad et al. | Dynamic coal blending under sustainability concerns: a case study from the Indian steel industry | |
| CN105987833B (en) | Integrated coal sample collecting and producing method and integrated coal sample collecting and producing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |